[gsvigruha]

Thanks! I will check Datalog out, i have never used it (though i know Prolog a bit).

So the main difference is then that my version is SQL based: alter table transactions add constraint c_amount check (amount > 10000 -> auth.name = user.man.name) # or something similar, where you refer to other tables via a chain of foreign keys.

Another extra feature is that you can use aggregators in constraints in case of a one to many relationship: https://github.com/gsvigruha/cosyan/blob/master/src/main/res...

[trurl]

I'm not sure why you need to restrict constraints between tables to be based on foreign keys. I guess maybe that is a limitation inherent to SQL?

We also allow constraints over aggregations. Though our syntax does require giving the result of the aggregation a temporary "table" name so that it can be used as part of the constraint.

[gsvigruha]

I dont need to, thats a design choice i made for the moment for various reasons, one being to stay close to SQL concepts.

It seems like your DB is basically a Datalog version of what im trying to do in SQL.